<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8;"/>
    <link href="style.css" type="text/css" rel="stylesheet"/>
</head>
<body>
<div class="square">
    <span></span>
    <span></span>
    <span></span>
    <div class="content">
        <h1>404</h1>
        <h2>很抱歉，没有该网页！</h2>
        <a href="index.html">返回首页</a>
    </div>
</div>
</body>
</html>